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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b34d037f1ea235a6fa262cac7ec14b448dd1e44e734af63508feae2ad98a52c' 
  AND token = 'SNWBuUnExnRbbW/xWj4eq0JsUllrkgmd+4m/dyzFijw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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