SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'e7891c6209d5677d8acece260b60c630ef88ce1231c2d6e72999d9b9deca140e' 
  AND token = 'YJqez/Gs4ijwV0spOlraPdwu3BGPgHUdRWOfMF0C5lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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