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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f010f4f384c402287d526fa4cd42316311f5f5524a3472863a2da7c4aab7c6f' 
  AND token = 'E77uW8tYdjdgtJe+5d0pqwZunnDuOSnDZu+2tMzoHLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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