Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '194470188aa4173f42a9a685d37adf4c18f19ae5ce7507451a5c5657f5b6de30' 
  AND token = 'atblbVmiLIyPhibtNddzJdG1jX4s4ojzTpRUGtcXn7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

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