This.
In the US, to contest a traffic ticket you need to appear in court on your assigned court date, or hire a lawyer to do this for you. If you believe you are innocent because the officer didn't clock your speed correctly, you can request a trial. That may require going back there yet again.
Since you obviously missed your court date and didn't pay the fine, you now have that warrant issued against you - as Often1 correctly stated, your 'crime' isn't speeding but failure to appear in traffic court. The warrant is issued for this, not for the speeding ticket. It is too late to argue the speeding ticket now, you failing to appear in court has made that pretty much final.

This definitely does not pertain to foreign visitors to the US holding non-US drivers' licenses. As long as OP does not get stopped in Utah, everything's fine. The US chose not to ratify any treaty governing international driving relations following up to the Geneva Convention on Road Traffic which dates back to 1949 and only covers very basic things. Recognition of suspensions is not one of them.
Check the code of your state and the sanctions imposed on violations: There's a marked distinction between "driving while privilege to do so is suspended or revoked" and " Operating with foreign driver's license when privilege suspended or revoked by the state", with the latter incurring a much less severe penalties.

This is very much the case with state highway patrol officers, and has been MO for decades. However, with highway speed traps set up by small-town police preying on passing motorists out on a mission to raise revenue for their municipalities' depleted coffers chances of getting a ticket for > 10 over are definitely there.

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During a brief period in the 1990s, Montana was unique in that it had no set daytime speed limit but a "reasonable and prudent" rule. All other states had set numerical limits, which were way lower than today's, too (most of the Northeast was still at 55...) . On a cross-country trip, I specifically took I-90 through Montana to take advantage of this newly-instituted freedom and enjoy some pedal-to-the-metal time in my fast-for-the-day car going through some really nice scenery with zero other traffic to watch out for.
The officer pulling me over strongly believed that going 150-plus mph (we're talking 1995 here, back when average cars weren't nearly as quick as they are today), was reckless, endangering and whatnot by itself in principle and no amount of arguing could convince him that this was indeed a perfectly safe speed to travel in given the long straight highway with perfect visibility and zero other vehicles on the road. I have forgotten if it was some local sheriff's office deputy or a state highway cop - probably the latter. He was also very unhappy about the long long time it took him to catch up with me and tried to include some more serious things like trying to elude him etc... This is not comparable to your case at all.

It's a sad fact of life that some US municipalities use speed traps on (interstate) highways passing through their boundaries as revenue sources. Most doing this actually depend on it for financial survival these days (you can read up on it). Some states even have laws against this practice.
Thanks to the internet (there's websites like speedtrap.org, phone apps like Waze etc...), these days, those operations can be detected and avoided even by unsuspecting visitors not familiar with the area with a little bit of research. I made sure I never exceeded the speed limit (or stopped for anything involving spending money) going through Maricopa county in AZ as long as Mr. Arpaio ran law enforcement there.

You now have three choices:
- do nothing and hope for everything to go away in time. This is only a good plan if you know 100% you a.) won't return to Utah in the next decade or two and b.) are not planning on any activity that requires any sort of background check by US authorities. Getting an ESTA issued and entering the US on it through an airport does not trigger thorough background checks at this time, but e.g. applying for Global Entry or a work permit and corresponding visa will. Also, one never knows where immigration policy in the US is heading. Rules may change pretty quickly following either a change in administration or as a fallout of events.

- pay the fine and court costs and be done. This is the easiest way out, and what everyone around here rightfully recommends.

- hire a lawyer and have him/her fight the charge. At this point, having missed the court date deadline, you will have to go through a lawyer who'll appeal to the court to do 'restitutio in integrum.' in lawyer-speak (arguing along the lines of no proper notification of your court date because the officer didn't note your address so the court could send you the summons or something like this....). This will prove to be way more expensive than simply paying the fine, but if you believe you were given that ticket in error and should be acquitted feel free to go down that avenue.