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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c16797f38df5ae38580ccf25f708389213e697638423f890be4a9361aebf15e' 
  AND token = 'QsidtPk55B8H3NoioVwucSNp5JDEDIRkEnF/IoLSv+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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