SELECT 
  bonuses 
FROM 
  cscart_promotions 
WHERE 
  status = 'A'

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_promotions",
      "access_type": "ALL",
      "rows": 5,
      "filtered": 100,
      "attached_condition": "cscart_promotions.`status` = 'A'"
    }
  }
}