Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89acb39805e49a8e2ef6f90e51f74115ce39ac2be415dbab5e5413fb5b8deb11' 
  AND token = 'qZ9XSQ9ZgGRzxX5+gSU0EGYpZ269TtsjFMv+iOVcTP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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