Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dc9152ed67e7e57c4afadabf643312cf4b5b9e39dbac62e1fbfebe9fb7071bb' 
  AND token = 'D57iV21Y6bPcXpoPtCirje9ckqMydqN+j2ej2dJCSfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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