Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc8055cd77ffabc73ada0d919c4acd433378de821c5913a27ca3350f121c663a' 
  AND token = '20SgoFhxY/R7usg8VAxUFceaB2Rx7NLEkiCnNLqYDdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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