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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '2da6873c69248fcfea864ac27bc39294239698b4ec2cda56d5af52c61ccb02d7' 
  AND token = 'Xi3UGTTj8rTLWolo0uWktkur9UDP+xDWD07mREtjgqQ=' 
  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"
    }
  }
}