Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c79100f940b25ff7bb5162ad340e46161bcfdf2e4b9f0f74576e9143b25c27b' 
  AND token = '/GbkyNaiIonQlAoGnEJ5Q8h3QCn3VtRhWivvCaSMUc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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