Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11c356946be58be5358a8780becc7e4dca2c2812e5aba2ca40c848e48f67ea7f' 
  AND token = 'sSf1kFg02a8akEubbLzDoED4AjoX7thL7qLtL4TFqY8=' 
  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"
    }
  }
}