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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ce949b97b2d4ee4e33cdbdeb14b51713192e50d52a5b627a887cc07abd01bbb' 
  AND token = 'CZmQs8QSZE5CZk8FwMkhXXgV+L3ZV+CvVTSQw+/4aJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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