SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '159db278d624c339cfaf4925607da55df7f0ec422a153472d9413b46003ceeaf' 
  AND token = 'hx++TFzDMeMgSFpu3e8OVJhFfVDvhQxrWTvzGtR71/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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