Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9409820304730f71a8701ead332aee9a80992b33c76a7b0197a50500900ff9a2' 
  AND token = '5IUbvqtsCaxMoh90qyHtOpXM5OAjd9H3kyVc35vtFW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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