SELECT 
  conditions 
FROM 
  cscart_promotions 
WHERE 
  status = 'A' 
  AND zone = 'catalog'

Query time 0.00033

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": 2,
      "filtered": "5.00",
      "cost_info": {
        "read_cost": "5.94",
        "eval_cost": "0.26",
        "prefix_cost": "6.20",
        "data_read_per_join": "208"
      },
      "used_columns": [
        "conditions",
        "zone",
        "status"
      ],
      "attached_condition": "((`nuie_scalesta_net`.`cscart_promotions`.`status` = 'A') and (`nuie_scalesta_net`.`cscart_promotions`.`zone` = 'catalog'))"
    }
  }
}