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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a60803dd2a8b190d7a16d961a6ba3ff133fceffd9b5878ded8a53d3ed71094f9' 
  AND token = 'TgHuZOZ0Pkc4nvwg/DzzmoGo5IMBX2A7zdkmULmZaIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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