Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '083f5a92b06e72431eb95df2a58df227a2379929367bcefbd908db83f53b3263' 
  AND token = 'c+QhDrFAweE+lYx2lifkAD++TrRDNSVBZB7gqfEmboU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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