SELECT 
  SQL_CALC_FOUND_ROWS (
    CASE WHEN products.parent_product_id <> 0 THEN products.parent_product_id ELSE products.product_id END
  ) AS product_id, 
  IF(
    shared_descr.product_id IS NOT NULL, 
    shared_descr.product, descr1.product
  ) as product, 
  companies.company as company_name, 
  GROUP_CONCAT(
    products.product_id 
    ORDER BY 
      products.parent_product_id ASC, 
      products.product_id ASC
  ) AS product_ids, 
  GROUP_CONCAT(
    products.product_type 
    ORDER BY 
      products.parent_product_id ASC, 
      products.product_id ASC
  ) AS product_types, 
  GROUP_CONCAT(
    products.parent_product_id 
    ORDER BY 
      products.parent_product_id ASC, 
      products.product_id ASC
  ) AS parent_product_ids, 
  products.product_type, 
  products.parent_product_id, 
  1 as instock_marker, 
  IF(
    products.product_type = 'C', 
    (
      SELECT 
        MAX(amount) 
      FROM 
        cscart_products 
      WHERE 
        parent_product_id = products.product_id
    ) > 0, 
    IF(
      products.amount > 0, 
      1, 
      IF(products.tracking = 'O', 1, 0)
    )
  ) as instock_sorting 
FROM 
  cscart_products as products 
  LEFT JOIN cscart_product_descriptions as descr1 ON descr1.product_id = products.product_id 
  AND descr1.lang_code = 'uk' 
  LEFT JOIN cscart_product_prices as prices ON prices.product_id = products.product_id 
  AND prices.lower_limit = 1 
  LEFT JOIN cscart_companies AS companies ON companies.company_id = products.company_id 
  INNER JOIN cscart_products_categories as products_categories ON products_categories.product_id = products.product_id 
  INNER JOIN cscart_categories ON cscart_categories.category_id = products_categories.category_id 
  AND (
    cscart_categories.usergroup_ids = '' 
    OR FIND_IN_SET(
      0, cscart_categories.usergroup_ids
    ) 
    OR FIND_IN_SET(
      1, cscart_categories.usergroup_ids
    )
  ) 
  AND cscart_categories.status IN ('A', 'H') 
  AND cscart_categories.storefront_id IN (0, 1) 
  LEFT JOIN cscart_ult_product_descriptions shared_descr ON shared_descr.product_id = products.product_id 
  AND shared_descr.company_id = 1 
  AND shared_descr.lang_code = 'uk' 
  LEFT JOIN cscart_images_links as img_links ON img_links.object_id = products.product_id 
  AND img_links.object_type = 'product' 
  AND img_links.type = 'M' 
WHERE 
  1 
  AND companies.status IN ('A') 
  AND (
    products.usergroup_ids = '' 
    OR FIND_IN_SET(0, products.usergroup_ids) 
    OR FIND_IN_SET(1, products.usergroup_ids)
  ) 
  AND products.status IN ('A') 
  AND prices.usergroup_id IN (0, 0, 1) 
  AND img_links.pair_id > 0 
  AND (
    1 
    AND products.product_id IN (
      23414, 23415, 23416, 23417, 23418, 23419, 
      23420, 23421, 23422, 23423, 23424, 
      23425, 23426, 23427, 23428, 23429, 
      23430, 23431, 23432, 23433, 23434, 
      23435, 23436, 23437, 23438, 23439, 
      23440, 23441, 23442, 23443, 23444, 
      23445, 23446, 23447, 23448, 23449, 
      23450, 23451, 23452, 23453, 23454, 
      23455, 23456, 23457, 23458, 23459, 
      23460, 23461, 23462, 23463, 23464, 
      23465, 23466, 23467, 23468, 23469, 
      23470, 23471, 23472, 23473, 23474, 
      23475, 23476, 23477, 23478, 23479, 
      23480, 23481, 23482, 23483, 23484, 
      23485, 23486, 23487, 23488, 23489, 
      23490, 23491, 23492, 23493, 23494, 
      23495, 23496, 23497, 23498, 23499, 
      23564, 23569, 23570, 23571, 23572, 
      23890, 23928, 23929, 23930, 23931
    )
  ) 
GROUP BY 
  product_id 
ORDER BY 
  instock_sorting DESC, 
  product asc, 
  products.product_id ASC 
LIMIT 
  0, 24

Query time 0.01081

JSON explain

{
  "query_block": {
    "select_id": 1,
    "filesort": {
      "sort_key": "if(products.product_type = 'C',(subquery#2) > 0,if(products.amount > 0,1,if(products.tracking = 'O',1,0))) desc, if(shared_descr.product_id is not null,shared_descr.product,descr1.product), products.product_id",
      "temporary_table": {
        "nested_loop": [
          {
            "table": {
              "table_name": "companies",
              "access_type": "system",
              "possible_keys": ["PRIMARY"],
              "rows": 1,
              "filtered": 100
            }
          },
          {
            "read_sorted_file": {
              "filesort": {
                "sort_key": "case when products.parent_product_id <> 0 then products.parent_product_id else products.product_id end",
                "table": {
                  "table_name": "products",
                  "access_type": "range",
                  "possible_keys": ["PRIMARY", "status"],
                  "key": "PRIMARY",
                  "key_length": "3",
                  "used_key_parts": ["product_id"],
                  "rows": 96,
                  "filtered": 90.50141144,
                  "index_condition": "products.product_id in (23414,23415,23416,23417,23418,23419,23420,23421,23422,23423,23424,23425,23426,23427,23428,23429,23430,23431,23432,23433,23434,23435,23436,23437,23438,23439,23440,23441,23442,23443,23444,23445,23446,23447,23448,23449,23450,23451,23452,23453,23454,23455,23456,23457,23458,23459,23460,23461,23462,23463,23464,23465,23466,23467,23468,23469,23470,23471,23472,23473,23474,23475,23476,23477,23478,23479,23480,23481,23482,23483,23484,23485,23486,23487,23488,23489,23490,23491,23492,23493,23494,23495,23496,23497,23498,23499,23564,23569,23570,23571,23572,23890,23928,23929,23930,23931)",
                  "attached_condition": "products.company_id = 1 and (products.usergroup_ids = '' or find_in_set(0,products.usergroup_ids) or find_in_set(1,products.usergroup_ids)) and products.`status` = 'A'"
                }
              }
            }
          },
          {
            "table": {
              "table_name": "descr1",
              "access_type": "eq_ref",
              "possible_keys": ["PRIMARY", "product_id"],
              "key": "PRIMARY",
              "key_length": "9",
              "used_key_parts": ["product_id", "lang_code"],
              "ref": ["lillyshop_lillyshop.products.product_id", "const"],
              "rows": 1,
              "filtered": 100,
              "attached_condition": "trigcond(descr1.lang_code = 'uk')"
            }
          },
          {
            "table": {
              "table_name": "shared_descr",
              "access_type": "eq_ref",
              "possible_keys": ["PRIMARY", "product_id", "company_id"],
              "key": "PRIMARY",
              "key_length": "13",
              "used_key_parts": ["product_id", "lang_code", "company_id"],
              "ref": ["lillyshop_lillyshop.products.product_id", "const", "const"],
              "rows": 1,
              "filtered": 100,
              "attached_condition": "trigcond(shared_descr.lang_code = 'uk')"
            }
          },
          {
            "table": {
              "table_name": "prices",
              "access_type": "ref",
              "possible_keys": [
                "usergroup",
                "product_id",
                "lower_limit",
                "usergroup_id"
              ],
              "key": "usergroup",
              "key_length": "3",
              "used_key_parts": ["product_id"],
              "ref": ["lillyshop_lillyshop.products.product_id"],
              "rows": 1,
              "filtered": 99.99145508,
              "attached_condition": "prices.lower_limit = 1 and prices.usergroup_id in (0,0,1)",
              "using_index": true
            }
          },
          {
            "table": {
              "table_name": "products_categories",
              "access_type": "ref",
              "possible_keys": ["PRIMARY", "pt"],
              "key": "pt",
              "key_length": "3",
              "used_key_parts": ["product_id"],
              "ref": ["lillyshop_lillyshop.products.product_id"],
              "rows": 1,
              "filtered": 100
            }
          },
          {
            "table": {
              "table_name": "cscart_categories",
              "access_type": "eq_ref",
              "possible_keys": ["PRIMARY", "c_status", "p_category_id"],
              "key": "PRIMARY",
              "key_length": "3",
              "used_key_parts": ["category_id"],
              "ref": ["lillyshop_lillyshop.products_categories.category_id"],
              "rows": 1,
              "filtered": 100,
              "attached_condition": "(cscart_categories.usergroup_ids = '' or find_in_set(0,cscart_categories.usergroup_ids) or find_in_set(1,cscart_categories.usergroup_ids)) and cscart_categories.`status` in ('A','H') and cscart_categories.storefront_id in (0,1)"
            }
          },
          {
            "table": {
              "table_name": "img_links",
              "access_type": "ref",
              "possible_keys": ["PRIMARY", "object_id"],
              "key": "object_id",
              "key_length": "81",
              "used_key_parts": ["object_id", "object_type", "type"],
              "ref": ["lillyshop_lillyshop.products.product_id", "const", "const"],
              "rows": 1,
              "filtered": 100,
              "index_condition": "img_links.object_id = products.product_id and img_links.object_type = 'product' and img_links.`type` = 'M'",
              "attached_condition": "img_links.pair_id > 0"
            }
          }
        ],
        "subqueries": [
          {
            "expression_cache": {
              "state": "uninitialized",
              "query_block": {
                "select_id": 2,
                "nested_loop": [
                  {
                    "table": {
                      "table_name": "cscart_products",
                      "access_type": "ALL",
                      "possible_keys": ["idx_parent_product_id"],
                      "rows": 11707,
                      "filtered": 100,
                      "attached_condition": "cscart_products.parent_product_id = products.product_id"
                    }
                  }
                ]
              }
            }
          }
        ]
      }
    }
  }
}