SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '8a5f506ba7c34b2d0de0a3e07a043e153973b70216579f2c7ce2b14389d3d2cd' 
  AND token = 'Xd2VIl1Z6YMLsuLnhqUrV/zJytP1RER6788fhBHKLgo=' 
  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"
    }
  }
}