SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6570f29f8e29acd829b867a46e9786965289e10863ae1b7ca56322dcd5f73aa7' 
  AND token = 'kJvuk5m9/8SpxumHtJoir6obvcQH07TMcHL3Qjcq2sE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

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