SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '6911c2c48b67858c0523545775b230203cf9adc8ccaf979c1a4c2f2c38f0d81d' 
  AND token = 'uavNVWDq6Af3YPAXP7vW6AK/gM4+provJsCQbpoSIP0=' 
  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"
    }
  }
}