The ICF has published the international ranking of best times ever (since 1975) at Sprint official events. Got problems with attaching the document, so here it is in plain text (if anybody wants the complete pdf file, just email asking for it at email@example.com and I'll pleased to attach it back). Here is the full list:
[Including the 10 World Best Times of winners during the official races in finals of the ICF events since 1975 (Olympic Games, World Championships, World Cups, European Championships, Continental Championships and events with acceptable high technical level).
Up to 2008 originally compiled by Prof. Dr. Habil Jochen Lenz Flatwater Racing Committee for 15 years.
Since 2009 has been compiled by Dr. Siarhei Shablyka (BLR), Sprint Committee]