SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '3f4af1e3df12e79772a603b5e7defb6dec50df6256f538923aef56502df66d43' 
  AND token = 'VynzQNH/CjvqG2y1QYbOV8S3BPk4s9JpoAKQs4dYXSQ=' 
  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"
    }
  }
}