Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2414fbbf4cfe62ddc910691d6a5099bb56b8ec4529f62c1a3ff392a8fe16b3d1' 
  AND token = '/b40djvBD9tZ3I2iGipwevjkOvjhkreB7MSWx26+ufU=' 
  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