Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8756c7d61e4b8b5b0dde09695e229a4ef099ad178e1b8f87fdf7831192859eca' 
  AND token = 'wIIBcepBMDNAlmefrkT/ZeRXiQm+m5nvtVhqcBCYw1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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