SELECT 
  cscart_promotions.*, 
  cscart_promotion_descriptions.name, 
  cscart_promotion_descriptions.detailed_description, 
  cscart_promotion_descriptions.short_description 
FROM 
  cscart_promotions 
  LEFT JOIN cscart_promotion_descriptions ON cscart_promotion_descriptions.promotion_id = cscart_promotions.promotion_id 
  AND cscart_promotion_descriptions.lang_code = 'de' 
  LEFT JOIN cscart_storefronts_promotions AS storefronts_promotions ON storefronts_promotions.promotion_id = cscart_promotions.promotion_id 
WHERE 
  1 
  AND IF(
    from_date, from_date <= 1743802033, 
    1
  ) 
  AND IF(to_date, to_date >= 1743802033, 1) 
  AND status IN ('A', 'H') 
  AND cscart_promotions.zone = 'catalog' 
  AND (
    storefronts_promotions.storefront_id = 1 
    OR storefronts_promotions.storefront_id IS NULL
  ) 
  AND (
    cscart_promotions.company_id IN (1, 39) 
    OR cscart_promotions.company_id = 0
  ) 
ORDER BY 
  cscart_promotions.stop_other_rules desc, 
  cscart_promotions.priority asc

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost": 0.073611871,
    "filesort": {
      "sort_key": "cscart_promotions.stop_other_rules desc, cscart_promotions.priority",
      "temporary_table": {
        "nested_loop": [
          {
            "table": {
              "table_name": "cscart_promotions",
              "access_type": "ALL",
              "loops": 1,
              "rows": 7,
              "cost": 0.011130435,
              "filtered": 100,
              "attached_condition": "if(cscart_promotions.from_date,cscart_promotions.from_date <= 1743802033,1) and if(cscart_promotions.to_date,cscart_promotions.to_date >= 1743802033,1) and cscart_promotions.`status` in ('A','H') and cscart_promotions.zone = 'catalog' and (cscart_promotions.company_id in (1,39) or cscart_promotions.company_id = 0)"
            }
          },
          {
            "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": ["cscart.cscart_promotions.promotion_id", "const"],
              "loops": 7,
              "rows": 1,
              "cost": 0.012307982,
              "filtered": 100,
              "attached_condition": "trigcond(cscart_promotion_descriptions.lang_code = 'de')"
            }
          },
          {
            "block-nl-join": {
              "table": {
                "table_name": "storefronts_promotions",
                "access_type": "index",
                "key": "PRIMARY",
                "key_length": "8",
                "used_key_parts": ["storefront_id", "promotion_id"],
                "loops": 7,
                "rows": 2,
                "cost": 0.041240774,
                "filtered": 100,
                "using_index": true
              },
              "buffer_type": "flat",
              "buffer_size": "17Kb",
              "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)"
            }
          }
        ]
      }
    }
  }
}