SELECT 
  bonuses 
FROM 
  cscart_promotions 
WHERE 
  status = 'A'

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "6.20"
    },
    "table": {
      "table_name": "cscart_promotions",
      "access_type": "ALL",
      "rows_examined_per_scan": 52,
      "rows_produced_per_join": 5,
      "filtered": "10.00",
      "cost_info": {
        "read_cost": "5.68",
        "eval_cost": "0.52",
        "prefix_cost": "6.20",
        "data_read_per_join": "416"
      },
      "used_columns": [
        "bonuses",
        "status"
      ],
      "attached_condition": "(`nuie_scalesta_net`.`cscart_promotions`.`status` = 'A')"
    }
  }
}