SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '284d1d3299f113602a313865f8e1696863b8cc575740155b132f6a71a258b66d' 
  AND token = 'UcbCzqJiBrkvhUTN/TftocRS+DdEcnGQpYrs2EFO9Ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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