Nginx rewriting URL with params to url without params

So I have this URL: /web/cms.php?open=unsereteam

I want to redirect to: https://www.camper-center.ch/portrait/unser-team.html

I tried this:

rewrite ^/web/cms.php?open=unsereteam$ https://www.camper-center.ch/portrait/unser-team.html permanent;

and this:

if ($args ~* "/web/cms.php?open=unsereteam") {
    rewrite ^ https://www.camper-center.ch/portrait/unser-team.html? last;
}

doesnt work...

Thanks to Ivan Shatsky it worked with:

if ($request_uri = "/web/cms.php?open=unsereteam") {
    rewrite ^ https://www.camper-center.ch/portrait/unser-team.html? last;
}

If I have more than one param like

if ($request_uri = "/web/listing.php?monat=03&jahr=2018") {
    rewrite ^ https://www.camper-center.ch/news/aktuell.html?month=03&year=2018? last;
}

Im triying something like:

if ($arg_monat = "02" & $arg_jahr="2020") { 
    rewrite ^/web/cms\.php$ https://www.camper-center.ch/news/aktuell.html?month=02&year=2020? last;
}

But this obviously doesn't work too.

Maybe you have a Solution for this too?

Thanks in advance!

Edit: Im trying something like this:

if ($arg_monat && $arg_jahr ) {
    rewrite ^/web/listing\.php$ https://www.camper-center.ch/news/aktuell.html?month=$arg_monat&year=$arg_jahr? last;
}

in the end I want the first url to redirect to the second:

/web/listing.php?monat=02&jahr=2020

to

/news/aktuell.html?month=02&year=2020

As being told a thousand times, both rewrite and location directives works with the normailzed URI which does not include the query part of the request, but only the /web/cms.php for your case. The $args variable contains the query part of the request (open=unsereteam for your case). It is a $request_uri that contains the full request URI in its original state. You can use

if ($request_uri = "/web/cms.php?open=unsereteam") {
    rewrite ^ https://www.camper-center.ch/portrait/unser-team.html? last;
}

or for case insensitive comparsion

if ($request_uri ~* "^/web/cms\.php\?open=unsereteam") {
    rewrite ^ https://www.camper-center.ch/portrait/unser-team.html? last;
}

but it won't match if your request would have, lets say, some additional query argument before the open one. The better one is

if ($arg_open = "unsereteam") { # or ($arg_open ~* "^unsereteam$") for case insensitive check
    # do the rewrite only on '/web/cms.php' URI
    rewrite ^/web/cms\.php$ https://www.camper-center.ch/portrait/unser-team.html? last;
}