Selenium with chromedriver doesn't start via cron
Finally found the solution. Boy this was bugging me for far too long. Issue was following missing PATH directories: /usr/bin, /usr/sbin in cron. Complete cron looks now like this:
SHELL=/bin/bash
PATH=/usr/local/bin/:/usr/bin:/usr/sbin
* * * * * cd /to/path && /to/path/.virtualenvs/selenium/bin/python /to/path/script.py -t arg1 arg2 > /to/path/log.txt 2>&1