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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8ae5c9e041a5bc023d17af3548b0af097c4ed670e46ef857c79d0254cea4fb8' 
  AND token = 'EK6PWm9bLBxsyx1dXRVIvzD/1AsyhTv3vXWeXzVJtoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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