SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '930f7649f3fa14dae2b43fea62c1f5ab0bc373aeac49da5bc46738c2a81b65a8' 
  AND token = 'YFgYRCcF6B1jphkkHtTbH3C6wqyTXN/2XTPwhuWzTv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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