SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5052216c519cc0618e56e47a908dd0747baaf8f6b8354bc665c831dc7630cddc' 
  AND token = 'QfbRIed6YF6uCi0MNe4J068bd/OD/7K/74oHqFuCiLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables