SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '596852652935d551b7eb8392b0baa5b0fd6534b63a7eddcac4fc4383f7c15be6' 
  AND token = '0UuF+1KPiJYM96DtQsij+wdkbM+QjFbVdNzcQOEwjVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

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