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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c991f6cd57162d1c913b15386bb32743d2f9358824ac811a74dbc32c58da89e' 
  AND token = '24JKR/iNgm6qE7unzAtil8Vjz+DivDJTkd7dcMctbqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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