You’re unlikely to find a more quintessential production of this campy horror musical than the one playing at JCC CenterStage through May 22.

Against a real-life backdrop of a global pandemic and climate catastrophe, the line in the prologue to “Little Shop of Horrors” about “the human race suddenly encounter(ing) a threat to its very existence” might not be a particularly welcoming start to a show. But when it comes to this timeless musical romp, existential dread has rarely been so fun.…