I had Nokia 5100s for years, really brilliant- even had a wee torch. Not quite waterproof but as good as (I used to drop mine into a pint of water and get people to phone it as a trick). But they're very old now, and generally not in great shape, so probably not the best idea.
The Samsung M110 Solid is the new equivalent I reckon. CE rated as dustproof, also has the wee LED torch (though it's less good) and it's more shock resistant. But it's a Samsung, which means it's horrible to use. I still haven't found where it keeps its apostrophe 😛 And the menu system is disasterous. Incredible really that a phone which is about 6 years newer is worse in every practical way, but there you go. You'll never kill it, but you may wish you could.
Alternatively, get any phone you want and an Otterbox.