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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67de67d3b81d47282026e5cf115f54afd6bb772631ba785cc17b1ae24140e6c4' 
  AND token = 'H/IwbrlF0bFMV9BkTMUUF6jWs0423xzq/xBIihXfr1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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