Elections in Equatorial Guinea, led by Teodoro Obiang Nguema, began on Sunday.
Mbasogo, who has been president for 43 years, has promised to return to the throne.
The voting station at the Nuestra Seora de Bisila school in the Semu area of Semu opened to allow scores of voters who had been waiting since early morning in.
Obiang holds the world record for the longest term of a head of state outside of the monarchy at 80 years old.
He has always been elected with more than 93 percent of the vote and his all-powerful Democratic Party of Equatorial Guinea (PDGE) holds 99 of the 100 seats in the outgoing National Assembly.
For the presidential election, Obiang faces two candidates: Andrès Esono Ondo, for the Convergence for Social Democracy (CPDS), the only opposition party that is not banned, and Buenaventura Monsuy Asumu of the Social Democratic Coalition Party (PCSD.
The third richest country in sub-Saharan Africa in terms of GDP per capita in 2021 according to the World Bank, most of its wealth remains concentrated in the hands of a few families.
In 2006 it was estmiated nearly 80 percent of the population lived below the poverty line.