Warsaw has a tiny shambles of an airport. If you flight is on-time (which with LOT is definitely a gamble - try
www.flightstats.com to look for historical information on this particular route) then you will most certainly make the connection. I don't think the airport was designed with connecting traffic in mind, so you'll find that the staff will do whatever they can to help you make the connection. Let me know if you need any more info.
Cheers.