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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56a8ddb132eadd64239256349d948fac18f199636c030630d67b20fe82d819c8' 
  AND token = 'WuQ+MtU6PViq5Nk+4dxqHOw1u9jWx6xZscevf8gWIbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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