SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'e959665702bcd38849806070ab92edf349657e422cd9b173aa87c8810e56e67c' 
  AND token = 'QwroMKrx8nHVvdAicpNYs6BZkC4XKvHh75yVfjeuyGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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