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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '031bd32f03eb3598518abd7459cd4e7391256b98ee29070c610e4e1c9f502b4a' 
  AND token = 'P846ZBFI6J8ov+TMfTEWU1cbZxwvOdWYnE6cAcKeiZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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