Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a5d70faedf51cf3369a112bb50434e53ab051715082a420007c1dd0a1783775' 
  AND token = 'MOBx41JAfuKvBcGWg6REPuitkHlgssFBfF1yJNtxfMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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