SELECT 
  * 
FROM 
  cscart_ec_configuration_product_dates 
WHERE 
  configuration_id = 1

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "3.72"
    },
    "table": {
      "table_name": "cscart_ec_configuration_product_dates",
      "access_type": "ALL",
      "rows_examined_per_scan": 8,
      "rows_produced_per_join": 1,
      "filtered": "12.50",
      "cost_info": {
        "read_cost": "3.52",
        "eval_cost": "0.20",
        "prefix_cost": "3.72",
        "data_read_per_join": "112"
      },
      "used_columns": [
        "id",
        "configuration_id",
        "date_from",
        "date_to",
        "reason"
      ],
      "attached_condition": "(`atulecarter_new_april_setup`.`cscart_ec_configuration_product_dates`.`configuration_id` = 1)"
    }
  }
}