documentclass{standalone}
usepackage{tikz}
usetikzlibrary{matrix}

begin{document}
    begin{tikzpicture}[
            table/.style={
                matrix of nodes,
                nodes in empty cells,
                nodes = {fill=gray, draw = black},
            }
        ]
        matrix (test) [table] {
            1 & 2 & 3 \
            4 &   & 5 \
        };
    end{tikzpicture}
end{document}