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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17d628a2d8a9f18ba6476e20b64f0172859e41ad12974c0522254e73dd5c792f' 
  AND token = 'x003FAJeepGWFasTY0LJrTj7vJSA8fL5XUSmQsQ2KOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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