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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7447477db60f72dff0cf7dd11cbc7efc47f4e3378aa5e511ec594d82f73edbd' 
  AND token = '1NcRSpwssxVa6L1WHqF5Tgk1+xREwIWdIqT1ynmvPNo=' 
  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"
    }
  }
}