Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb4c0461c6eea7ac1e67641402dc65a82c8bd96559b15ffcd5532dcfcf9906f5' 
  AND token = 'Xvyiag46xMeH7dd5V308z0ZWKeQACM5Eh0mVjJ0LUkc=' 
  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