Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6317abd699c7dcf1fee899953c838a65fdfe5ca21fbec8d7a864be532681cd38' 
  AND token = 'zTjuk3tAx5Uqq9US/6g6ScuUMSW1mymvDuglKceylNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}