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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1beffaba4d4ec7c9b12174a5c05c1a3179c3418970a43b825fc67a6aa2fabf4c' 
  AND token = 'baFn10WKdK+c/Djz3hQzTd/8UrZa2qrFV2o7lM55Zh4=' 
  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"
    }
  }
}