SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'fcfb30e59cc8776d73e03f35b4dfcdc0c2198e877911670611b7a85c4144212d' 
  AND token = 'PBZZb3nH7QBCTFiVxqOHaMJYmZnK79uMyv7SsgfglCM=' 
  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"
    }
  }
}