Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4680ac8a0956315d7a189a8310b75ebd791686d39e45604f12752149fabb073' 
  AND token = 'efR4EO8hcNExUul0k+mzEyjHucXpDGIKsjSB0or+62Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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