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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f71a0ed2b6db3dddc18571cc9d42e987a92f8cb67414312ada49155b7ec409d' 
  AND token = 'Bg5v2D/4YjE8YBTKRmLMQMesvAusq5ddHAkGarCgay0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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