Villain is 30/5/1

PokerStars No-Limit Hold'em, $0.50 BB (6 handed) Poker-Stars Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

MP ($60.05)
CO ($53.55)
Hero ($49.25)
SB ($36.85)
BB ($13.30)
UTG ($64.05)

Preflop: Hero is Button with 4, 5.
3 folds, Hero raises to $2, 1 fold, BB calls $1.50.

Flop: ($4.25) J, Q, T (2 players)
BB checks, Hero bets $12

So with a loose shortstack in the blinds, perhaps I should fold this preflop. That aside, how bad is this on the flop? I don't think he needs to fold that often for this to be +EV, but I haven't done the math.