Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4a7a3301fc37f3c24b82c7aa0db0dc8c3b8c704baf09746e2e992e3526ffde7' 
  AND token = 'tG8cSGwtTeO4jthripb4msCo8IgoQqBDkq4hPrjB2yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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