Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3e0422a8e0bd012a79f2ec3c58c7eaaf40189dd51c4095feda2ae0e16638a89' 
  AND token = '3sKjEhQXrG8CLsSvcFKYTBUCn01GdfNA3+n+cK1vhPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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