SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'db400cd4a258795d32f1b2c2cbb2ee46a85d2431484885c8ee27012f68b906b1' 
  AND token = 'SgzZr+zG7zdzLQgXuvsasuWB1XZUZhv9MKuoGI2Kr1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00007

JSON explain

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