SELECT 
  cscart_product_feature_variants.variant_id, 
  cscart_product_feature_variants.position, 
  cscart_product_feature_variants.color, 
  cscart_product_feature_variant_descriptions.variant 
FROM 
  cscart_product_feature_variants 
  LEFT JOIN cscart_product_feature_variant_descriptions ON cscart_product_feature_variants.variant_id = cscart_product_feature_variant_descriptions.variant_id 
  AND cscart_product_feature_variant_descriptions.lang_code = 'ru' 
WHERE 
  cscart_product_feature_variants.variant_id IN (
    1862, 1870, 4777, 1910, 1856, 4800, 346, 
    1987, 1859, 4766, 3719, 524, 1978, 548, 
    1938, 4783, 500, 4862, 1913, 365, 4773, 
    4778, 4787, 2178, 1966, 4790, 4763, 
    4772, 1575, 1970, 4764, 1510, 3709, 
    1934, 3953, 4755, 222, 2970, 4796, 3745, 
    4801, 4818, 1939, 4792, 1895, 4753, 
    4775, 4867, 4804, 4776, 2998, 4754, 
    5137
  ) 
ORDER BY 
  cscart_product_feature_variants.position ASC, 
  cscart_product_feature_variant_descriptions.variant ASC

Query time 0.00105

JSON explain

{
  "query_block": {
    "select_id": 1,
    "filesort": {
      "sort_key": "cscart_product_feature_variants.position, cscart_product_feature_variant_descriptions.variant",
      "temporary_table": {
        "nested_loop": [
          {
            "table": {
              "table_name": "cscart_product_feature_variants",
              "access_type": "range",
              "possible_keys": ["PRIMARY"],
              "key": "PRIMARY",
              "key_length": "3",
              "used_key_parts": ["variant_id"],
              "rows": 53,
              "filtered": 100,
              "index_condition": "cscart_product_feature_variants.variant_id in (1862,1870,4777,1910,1856,4800,346,1987,1859,4766,3719,524,1978,548,1938,4783,500,4862,1913,365,4773,4778,4787,2178,1966,4790,4763,4772,1575,1970,4764,1510,3709,1934,3953,4755,222,2970,4796,3745,4801,4818,1939,4792,1895,4753,4775,4867,4804,4776,2998,4754,5137)"
            }
          },
          {
            "table": {
              "table_name": "cscart_product_feature_variant_descriptions",
              "access_type": "eq_ref",
              "possible_keys": ["PRIMARY"],
              "key": "PRIMARY",
              "key_length": "9",
              "used_key_parts": ["variant_id", "lang_code"],
              "ref": [
                "lillyshop_lillyshop.cscart_product_feature_variants.variant_id",
                "const"
              ],
              "rows": 1,
              "filtered": 100,
              "attached_condition": "trigcond(cscart_product_feature_variant_descriptions.lang_code = 'ru')"
            }
          }
        ]
      }
    }
  }
}