Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc54572e77a9abc97315a4d6b8d094b22829989ae64d0f026f18d30f99a40af1' 
  AND token = 'zh4d7K1ssWUEVr3XsBNXOWjh2Xw0XVowgKg4NeWXpyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

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