Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bb716464b3411ea9fdfb418260efd85e94dce958f11af848bda3e927cb219cb' 
  AND token = '48fdFaLoaTGZ1H02iQ67Q8UfHfGVFdZT0A4gyg6RU0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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