SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed28e76908bf283c0a1594311d4340374bf11b9dff6e083e3d9d645f78fa2b79' 
  AND token = 'X5FM0BWcYGogEYYkWQW7r5KibatiC34XoEHYhGh/S10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

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