SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ed40ede15b2a748d2c9beccf696d856a3d302ba9568d4ba77000d5336832e01' 
  AND token = 'K4Z1in0OjGKDIcg2jzaTmRuqWBQUt2H/nyVN468bVyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

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