Most commercially available laugh tracks, such as those used in SitComs are, in fact, recordings of real, live audiences at a real show. The chances are, though, that that recording was was taken from a very early television recording or even a radio comedy broadcast.
According to sound engineers at Viacom, most of the commonly used laugh track samples were recorded during the early 1930's to the late 1940's, back when people knew how to laugh out loud and mean it.