What is The Speed of Light?

Could a possible explanation for why the speed of light is constant be that it is the only thing that we know of that isn't moving?

Put another way, if everything we know of was moving incredibly quickly, except light, could that account for our perception of its constant speed?

Under this hypothesis (which I know could be waaay off or simply silly), as you approach the speed of light, you approach a standstill. In that way, the speed of light is intrinsically a limit or barrier.

Again, this might make no sense at all and I'm ok with that. It was just a thought I had.

If this is wrong, could you explain why, in laymans terms?