SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2184b8a3e85ed1fff4145b3d4feacd8fb5bb2dbe2433455d371b9fa89336e62a' 
  AND token = 'anJW/rU+unjzBEFAVrqqEv+2vBSeNggpLwenDkZEGMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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