Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2a9eda4716fe3b6c67588b9b4cd0298766eefdc93f3704c7571d1a2fe9087b9' 
  AND token = 'oFZyIlyJdilfpDEtjMabuH05f2bsjbnRzB1zS+jb8ZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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