SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56fe710e191c8d3a46c29362377552ebf830456596008eb06bc3232d992b7f6d' 
  AND token = '9+5D/SZN2uDe601fZz0RrZm1rNz7HBkYmMnCp1sWaNo=' 
  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