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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '949b2df65d77024d993cbffbdf309bed4cbe0c33baf62e918d04fa53fcb1661f' 
  AND token = 'MLUTuJatK2WdRvVP+/sASYm/Mz72lgiu85Derf3eq1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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