Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6d3b1d4c62d8df29a9db2295c8123e608bd1716e414ecd5b6d98577efef39cc' 
  AND token = 'NC2vZnNzA8xM9uuaXk/A1FeuoXp2+EIMvihBOO7a1nI=' 
  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"
    }
  }
}