Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '129c40a9f8ed5ed077d143eeb2f21697b9474d52a9bbee54c9146da36ed230aa' 
  AND token = 'b83jUndrozNYLuAvW+5Qfng0LpO+AbP+A1uJ1dNmjrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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