Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c6ce6598ed5bb94c85781370221a9573cf881191bc475c2814f521321268181' 
  AND token = 'ERZaTRBU8nRyVVm7sABABSQYua51LBOlyGqUf8kJCx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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