from selenium.webdriver.common.action_chains import ActionChains
ActionChains(drivers).move_to_element(drivers.find_element_by_id('element_id')).click().perform()
, если вы хотите выбрать любое значение,
menu1 = drivers.find_element_by_xpath('html/path/of/select/box')
sub_menu0 = drivers.find_element_by_xpath('html/path/of/selected/option')
clickon = drivers.find_element_by_xpath(path/of/option/where/you/want/to/click)
action = ActionChains(drivers)
action.move_to_element(menu1)
action.move_to_element(sub_menu0)
action.click(clickon)
action.perform()