Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ac2b3b58e4f6ff39d76649600be806681d1a04181c53284008186c9d2bbe42f' 
  AND token = 'sADVhVytn9c79piD+LHWFeySyL9LbdHzyWr84fCZquU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}