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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aca123a89121ba5b8522de2875502240be4b76642276b9b1b1ee2a48cf91fca' 
  AND token = 'tsB6WDgBOuUZyuhON4DGCWOlqtogDQt6Yuct/1Qhxok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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