SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d685766057ed5b98e5ba5897fe356fc70c923a1ffaa3e2d8a7cc76ab3b2ba8f' 
  AND token = 'yTlZwtme14Ddq4h82gVKVbovYZAUWOgXzh3JRgalzqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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