SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23e1f207d3b2a4b57ae5b05bfde1d443ddd5568172f3545699552fb54587e5f1' 
  AND token = 'LZ8ZFuVUa2kHFC+EXsisRMXgpqALGozwtJmkHKPn6Bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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