SELECT 
  param, 
  param_3 
FROM 
  cscart_static_data 
WHERE 
  param_5 = '3' 
  AND section = 'A'

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "7.30"
    },
    "table": {
      "table_name": "cscart_static_data",
      "access_type": "ref",
      "possible_keys": [
        "section"
      ],
      "key": "section",
      "used_key_parts": [
        "section"
      ],
      "key_length": "3",
      "ref": [
        "const"
      ],
      "rows_examined_per_scan": 24,
      "rows_produced_per_join": 2,
      "filtered": "10.00",
      "cost_info": {
        "read_cost": "2.50",
        "eval_cost": "0.48",
        "prefix_cost": "7.30",
        "data_read_per_join": "15K"
      },
      "used_columns": [
        "param",
        "param_3",
        "param_5",
        "section"
      ],
      "attached_condition": "(`sachinecarter_march_setup`.`cscart_static_data`.`param_5` = '3')"
    }
  }
}