Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4391af325c2d7e3f6477332a33a99d69800036ee6e2312fd5042318488237140' 
  AND token = 'ITpLFGxkL0doQnna2gjaBw7ZlyU2A1Ue8E89m7wbXNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

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