SELECT 
  * 
FROM 
  cscart_length_of_stay 
WHERE 
  product_id = 166

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "1.80"
    },
    "table": {
      "table_name": "cscart_length_of_stay",
      "access_type": "ALL",
      "rows_examined_per_scan": 4,
      "rows_produced_per_join": 1,
      "filtered": "25.00",
      "cost_info": {
        "read_cost": "1.60",
        "eval_cost": "0.20",
        "prefix_cost": "1.80",
        "data_read_per_join": "32"
      },
      "used_columns": [
        "id",
        "product_id",
        "date_from",
        "date_to",
        "minimum_length_of_stay",
        "maximum_length_of_stay"
      ],
      "attached_condition": "(`atulecarter_march_setup`.`cscart_length_of_stay`.`product_id` = 166)"
    }
  }
}