SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a02fb2cf56b1bf91e6c0ab8d8b49ccc7d505631e691927438c59449a4d9d129' 
  AND token = 'Q/qdT/H6P8slNz6Yg6skz/tItVRd9uhx3iZCqK/JfW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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