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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6849b241b714eaee39649829920c284afeb063dce142c40269e26d3a89fe2075' 
  AND token = '2hTT8so0DHY+/7YoUuAJ/pq71xUQffRdEUoRCwB8k28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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