Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef51697e753369ebe62ca9f3877e6cd0d1917f1f2b50c78ca5050ac955f9d5a4' 
  AND token = '8D3zfMiFt0E0FjIWwRvje3FObH1PMl9GJLHfaPPLMKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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