It looks like the use of this table was removed in an upgrade from 4.0 to 4.0.1. And the security design doc explains the reason.
I have had trouble with sec_sessions
and sec_session_properties
for the same reason. I have truncated these tables in the past without any serious consequences, but I can't guarantee that this is the case for you. Another problem with this series of tables is that the indexes are even larger than the tables themselves.