SELECT 
  * 
FROM 
  cscart_ble_product_detail_items 
WHERE 
  detail_id = 391 
ORDER BY 
  position, 
  title ASC

Query time 0.00267

JSON explain

{
  "query_block": {
    "select_id": 1,
    "read_sorted_file": {
      "filesort": {
        "sort_key": "cscart_ble_product_detail_items.position, cscart_ble_product_detail_items.title",
        "table": {
          "table_name": "cscart_ble_product_detail_items",
          "access_type": "ALL",
          "rows": 10870,
          "filtered": 100,
          "attached_condition": "cscart_ble_product_detail_items.detail_id = 391"
        }
      }
    }
  }
}

Result