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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f698f66cbfa37d756c8934c615bbcad25573018d5caa3bf8e161a8d1caf49c02' 
  AND token = 'wL52pmgLoOgrUYjlpv7PB0+7bE6BkDvl9N9YBQ4H9Ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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