Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8a8344d0938d00f4518aca4c7a46eba2a6fd993c7e97972bdb77488a3fc432c' 
  AND token = 'zT6yBai2+YxYFetYs8C+QviWeEuoTp9GD/3a/3hhoOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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