Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '911b5a8382e11a9e78192f55e92ed11632a014e8795b719f9c77c3dc543847c3' 
  AND token = '9JtltG935ITimNj6zchiNVy+/0pnvWTZpVJuVe/Kxio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

Explain
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE								Impossible WHERE noticed after reading const tables