SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9da82365fdbf51bd17ec1b042933744ac5de36310e3556fbae343fec24c5b92' 
  AND token = 'VJSHYnBmjyWoFuvQfD0Rm1VRKlGkPQC6kgx2h41THHE=' 
  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"
    }
  }
}