SELECT 
  items.chain_id, 
  items.product_id, 
  items.products, 
  items.modifier, 
  items.modifier_type, 
  items.date_from, 
  items.date_to, 
  items.display_in_promotions, 
  items.status, 
  descr.name, 
  descr.description, 
  p.company_id 
FROM 
  cscart_buy_together AS items 
  LEFT JOIN cscart_products AS p ON p.product_id = items.product_id 
  LEFT JOIN cscart_buy_together_descriptions AS descr ON items.chain_id = descr.chain_id 
  AND descr.lang_code = 'ro' 
WHERE 
  items.product_id = 1302521 
  AND items.status = 'A' 
  AND (
    (
      items.date_from <= 1776891600 
      AND items.date_to >= 1776891600
    ) 
    OR (
      items.date_from = 0 
      AND items.date_to >= 1776891600
    ) 
    OR (
      items.date_from <= 1776891600 
      AND items.date_to = 0
    ) 
    OR (
      items.date_from = 0 
      AND items.date_to = 0
    )
  )

Query time 0.00794

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "314.60"
    },
    "nested_loop": [
      {
        "table": {
          "table_name": "descr",
          "access_type": "system",
          "possible_keys": [
            "PRIMARY"
          ],
          "rows_examined_per_scan": 0,
          "rows_produced_per_join": 1,
          "filtered": "0.00",
          "const_row_not_found": true,
          "cost_info": {
            "read_cost": "0.00",
            "eval_cost": "0.10",
            "prefix_cost": "0.00",
            "data_read_per_join": "176"
          },
          "used_columns": [
            "chain_id",
            "name",
            "description",
            "lang_code"
          ]
        }
      },
      {
        "table": {
          "table_name": "items",
          "access_type": "ALL",
          "rows_examined_per_scan": 3016,
          "rows_produced_per_join": 5,
          "filtered": "0.18",
          "cost_info": {
            "read_cost": "313.53",
            "eval_cost": "0.54",
            "prefix_cost": "314.06",
            "data_read_per_join": "557"
          },
          "used_columns": [
            "chain_id",
            "product_id",
            "products",
            "modifier",
            "modifier_type",
            "date_from",
            "date_to",
            "display_in_promotions",
            "status"
          ],
          "attached_condition": "((`maniamall_cscart`.`items`.`product_id` = 1302521) and (`maniamall_cscart`.`items`.`status` = 'A') and (((`maniamall_cscart`.`items`.`date_from` <= 1776891600) and (`maniamall_cscart`.`items`.`date_to` >= 1776891600)) or ((`maniamall_cscart`.`items`.`date_from` = 0) and (`maniamall_cscart`.`items`.`date_to` >= 1776891600)) or ((`maniamall_cscart`.`items`.`date_to` = 0) and (`maniamall_cscart`.`items`.`date_from` <= 1776891600)) or ((`maniamall_cscart`.`items`.`date_to` = 0) and (`maniamall_cscart`.`items`.`date_from` = 0))))"
        }
      },
      {
        "table": {
          "table_name": "p",
          "access_type": "const",
          "possible_keys": [
            "PRIMARY"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
            "product_id"
          ],
          "key_length": "3",
          "ref": [
            "const"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 5,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "0.00",
            "eval_cost": "0.54",
            "prefix_cost": "314.60",
            "data_read_per_join": "23K"
          },
          "used_columns": [
            "product_id",
            "company_id"
          ]
        }
      }
    ]
  }
}

Result