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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da9d8d1c0dbf38eda31b44e95f9390cb61a24b76102a75fbe908cc2b8b2bf204' 
  AND token = 'jeXHPzUpTcEUsDoacf4+0HmRPsFN/wCKYTSfjhIeinY=' 
  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"
    }
  }
}