SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b88a69247f8835e37efd8147dc199f76b8df323be8e6a92525138a04cc46b61' 
  AND token = 'HaVl6/Zi+VSAeGu/AuyPfPubGIlXHOHDhP5qB+9rn/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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