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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fbb17a2ee04d3abcc91c49249ae4b0d32fc915d8c97367c35dcea8d6644fc27' 
  AND token = 'DfOh/6tZQ0nHUpXeir7Z8UbCbLzE5pSTbTRv840XPPU=' 
  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"
    }
  }
}