Sandbox

SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'f4ff71df480a94fcde18a50e108ff62683b7182bb7ab125da0e45b00c72ef8ec' 
  AND token = 'WriX+lqUeI/fpxkVMNwrLazLgmWS1yUcJrHt5wLoLcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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