SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dc10b97b6b0e16681ead3234a0ffe391d5a4546cb603e1976337435a709dd59' 
  AND token = '6g7uvQBRgIMBH2W+z+u1e1mb8BYbkjDYOKT0SCxNbfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

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