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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cabbec280dea2d519f0ee3e3677e7c7d3572a1631793525dde5b3c77c533c561' 
  AND token = '0eKcRwywkMxKO8hmh3kFaZDpOSWlAKaX5sUwn9iLL98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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