SELECT 
  cscart_promotions.*, 
  cscart_promotion_descriptions.name, 
  cscart_promotion_descriptions.detailed_description, 
  cscart_promotion_descriptions.short_description, 
  cscart_ab__dotd.* 
FROM 
  cscart_promotions 
  LEFT JOIN cscart_promotion_descriptions ON cscart_promotion_descriptions.promotion_id = cscart_promotions.promotion_id 
  AND cscart_promotion_descriptions.lang_code = 'uk' 
  LEFT JOIN cscart_storefronts_promotions AS storefronts_promotions ON storefronts_promotions.promotion_id = cscart_promotions.promotion_id 
  LEFT JOIN cscart_ab__dotd ON cscart_ab__dotd.promotion_id = cscart_promotions.promotion_id 
WHERE 
  1 
  AND cscart_promotions.zone = 'catalog' 
  AND (
    storefronts_promotions.storefront_id = 1 
    OR storefronts_promotions.storefront_id IS NULL
  ) 
ORDER BY 
  cscart_promotion_descriptions.name asc

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "filesort": {
      "sort_key": "cscart_promotion_descriptions.`name`",
      "temporary_table": {
        "nested_loop": [
          {
            "table": {
              "table_name": "cscart_promotions",
              "access_type": "ALL",
              "rows": 22,
              "filtered": 100,
              "attached_condition": "cscart_promotions.zone = 'catalog'"
            }
          },
          {
            "table": {
              "table_name": "cscart_promotion_descriptions",
              "access_type": "eq_ref",
              "possible_keys": ["PRIMARY"],
              "key": "PRIMARY",
              "key_length": "9",
              "used_key_parts": ["promotion_id", "lang_code"],
              "ref": [
                "lillyshop_lillyshop.cscart_promotions.promotion_id",
                "const"
              ],
              "rows": 1,
              "filtered": 100,
              "attached_condition": "trigcond(cscart_promotion_descriptions.lang_code = 'uk')"
            }
          },
          {
            "block-nl-join": {
              "table": {
                "table_name": "storefronts_promotions",
                "access_type": "index",
                "key": "PRIMARY",
                "key_length": "8",
                "used_key_parts": ["storefront_id", "promotion_id"],
                "rows": 213,
                "filtered": 100,
                "using_index": true
              },
              "buffer_type": "flat",
              "buffer_size": "84Kb",
              "join_type": "BNL",
              "attached_condition": "trigcond(storefronts_promotions.storefront_id = 1 or storefronts_promotions.storefront_id is null) and trigcond(storefronts_promotions.promotion_id = cscart_promotions.promotion_id)"
            }
          },
          {
            "table": {
              "table_name": "cscart_ab__dotd",
              "access_type": "eq_ref",
              "possible_keys": ["PRIMARY"],
              "key": "PRIMARY",
              "key_length": "3",
              "used_key_parts": ["promotion_id"],
              "ref": ["lillyshop_lillyshop.cscart_promotions.promotion_id"],
              "rows": 1,
              "filtered": 100
            }
          }
        ]
      }
    }
  }
}