i saw that inside wp_newsletter table
that there is a field named ‘token’
i think i may upload contacts directly by mysql/phpadmin populating all fields
but i can understand how this ‘token’ field is generated
and how can just in the case generate it(for avoiding db messes)
No, but a token is what grant the subscriber security when editing his profile. So use a random token for every subscriber you import. Mysql has some function to generate random numbers for example.