The 555 is either a monostable timer or it is an astable oscillator. Your circuit is not an astable unless its power supply is motorboating.
If pin 2 is low then it never times out, its output will stay high.
Pin 4 is the reset pin. When pin 4 is low then the IC is continuously reset with its capacitor discharged and its output low.
When pin 4 is high then the timer works normally.
Your circuit is missing two very important supply bypass capacitors. The datasheet for an ordinary 555 recommends using a 0.1uF ceramic disc plus a minimum of 1uF electrolytic (use 10uF to 100uf).
If pin 2 is low then it never times out, its output will stay high.
Pin 4 is the reset pin. When pin 4 is low then the IC is continuously reset with its capacitor discharged and its output low.
When pin 4 is high then the timer works normally.
Your circuit is missing two very important supply bypass capacitors. The datasheet for an ordinary 555 recommends using a 0.1uF ceramic disc plus a minimum of 1uF electrolytic (use 10uF to 100uf).