Mieses-Kotrc Variation - what to do now?

That is definitely a poison pawn in the Scandiavian. Those lines can get very complex. Here is a trap in the scandinavian.

dont play Nd4. Play Bb5+
nd4 wins the queen... unless bb5+ leads to mate i dont see why i play that
try setting up your knights to attack c7 and f7. after Rg1 of course. blacks only move after that is Qh3. but seriously, how could you say there is no compensation?!

In response to 3....Qe6, I like 4.Qe2. 4.Be2 creates that poison pawn, so whenever I face this, I offer the queen exchange. Either they exchange queens and you have two minor pieces developed and they have nothing or you've got a knight and queen developed and they've only got a vulnerable queen.