SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a9d6a7c072af2e5f502e7cd82d407abb840596546a172039014d490dc92f95a' 
  AND token = 'xCf+cdVX9bTYdB0zEOs4QDtw0kXvPYeR4xqVWF+8Ljk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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