This is a bit unusual timestamp, but still readily parsable.
Here I used base R only, but should not be a problem with lubridate. You have to use as_date or as_datetime, and it will return UTC time by default. What problem did you face?
# as date object
as.Date(x = "Wed Feb 12 22:29:36 +0000 2020", format = "%a %B %d %H:%M:%S %z %Y")
#> [1] "2020-02-12"
# as date-time object
as.POSIXct(x = "Wed Feb 12 22:29:36 +0000 2020", format = "%a %B %d %H:%M:%S %z %Y")
#> [1] "2020-02-13 03:59:36 IST"
Created on 2020-02-26 by the reprex package (v0.3.0)