SELECT 
  COUNT(*) 
FROM 
  cscart_ec_configuration_product 
WHERE 
  product_id = 146 
  AND status = 'A'

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "2.40"
    },
    "table": {
      "table_name": "cscart_ec_configuration_product",
      "access_type": "ref",
      "possible_keys": [
        "status"
      ],
      "key": "status",
      "used_key_parts": [
        "status"
      ],
      "key_length": "3",
      "ref": [
        "const"
      ],
      "rows_examined_per_scan": 2,
      "rows_produced_per_join": 0,
      "filtered": "33.33",
      "cost_info": {
        "read_cost": "2.00",
        "eval_cost": "0.13",
        "prefix_cost": "2.40",
        "data_read_per_join": "37"
      },
      "used_columns": [
        "status",
        "product_id"
      ],
      "attached_condition": "(`pankajecarter_systemsix`.`cscart_ec_configuration_product`.`product_id` = 146)"
    }
  }
}