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 = 'ro' 
  INNER JOIN cscart_ult_objects_sharing ON (
    cscart_ult_objects_sharing.share_object_id = cscart_promotions.promotion_id 
    AND cscart_ult_objects_sharing.share_company_id = 1 
    AND cscart_ult_objects_sharing.share_object_type = 'promotions'
  ) 
WHERE 
  1 
  AND IF(
    from_date, from_date <= 1776632520, 
    1
  ) 
  AND IF(to_date, to_date >= 1776632520, 1) 
  AND status IN ('A', 'H') 
  AND cscart_promotions.zone = 'catalog' 
ORDER BY 
  cscart_promotions.priority asc

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "4.24"
    },
    "ordering_operation": {
      "using_filesort": true,
      "cost_info": {
        "sort_cost": "1.00"
      },
      "nested_loop": [
        {
          "table": {
            "table_name": "cscart_promotions",
            "access_type": "ALL",
            "possible_keys": [
              "PRIMARY"
            ],
            "rows_examined_per_scan": 7,
            "rows_produced_per_join": 0,
            "filtered": "14.29",
            "cost_info": {
              "read_cost": "2.44",
              "eval_cost": "0.10",
              "prefix_cost": "2.54",
              "data_read_per_join": "71"
            },
            "used_columns": [
              "promotion_id",
              "company_id",
              "conditions",
              "bonuses",
              "to_date",
              "from_date",
              "priority",
              "stop",
              "zone",
              "conditions_hash",
              "status",
              "number_of_usages",
              "users_conditions_hash"
            ],
            "attached_condition": "((0 <> if(`maniamall_cscart`.`cscart_promotions`.`from_date`,(`maniamall_cscart`.`cscart_promotions`.`from_date` <= 1776632520),1)) and (0 <> if(`maniamall_cscart`.`cscart_promotions`.`to_date`,(`maniamall_cscart`.`cscart_promotions`.`to_date` >= 1776632520),1)) and (`maniamall_cscart`.`cscart_promotions`.`status` in ('A','H')) and (`maniamall_cscart`.`cscart_promotions`.`zone` = 'catalog'))"
          }
        },
        {
          "table": {
            "table_name": "cscart_promotion_descriptions",
            "access_type": "eq_ref",
            "possible_keys": [
              "PRIMARY"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "promotion_id",
              "lang_code"
            ],
            "key_length": "9",
            "ref": [
              "maniamall_cscart.cscart_promotions.promotion_id",
              "const"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 0,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "0.25",
              "eval_cost": "0.10",
              "prefix_cost": "2.89",
              "data_read_per_join": "799"
            },
            "used_columns": [
              "promotion_id",
              "name",
              "short_description",
              "detailed_description",
              "lang_code"
            ]
          }
        },
        {
          "table": {
            "table_name": "cscart_ult_objects_sharing",
            "access_type": "eq_ref",
            "possible_keys": [
              "PRIMARY"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "share_object_id",
              "share_company_id",
              "share_object_type"
            ],
            "key_length": "159",
            "ref": [
              "maniamall_cscart.cscart_promotions.promotion_id",
              "const",
              "const"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 0,
            "filtered": "100.00",
            "using_index": true,
            "cost_info": {
              "read_cost": "0.25",
              "eval_cost": "0.10",
              "prefix_cost": "3.24",
              "data_read_per_join": "159"
            },
            "used_columns": [
              "share_company_id",
              "share_object_id",
              "share_object_type"
            ],
            "attached_condition": "(`maniamall_cscart`.`cscart_ult_objects_sharing`.`share_object_id` = `maniamall_cscart`.`cscart_promotions`.`promotion_id`)"
          }
        }
      ]
    }
  }
}

Result