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I wouldn't trust it, for the other stud to snap someone probably torqued it beyond elastic, the reason you snapped it is because in plastic deformation you can't torque it down, it feels " loose" until it snaps. What guarantees someone didn't mess up the other 4? Check them with a tq wrench to see if they can still be torqued down.
TT is correct, check the others. I found the original lugnuts and lugs are better then the current ones. Mostly the lug nuts today strip out very quickly. If you have the originals on the car then I wouldn't worry as much. I've driven on 4 originals for years and some track time as well. The fronts are easy to replace as well.