Sandbox

SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '5cdb6d00237a99036807153a716380ec177ce988b23bcaab1c9235891021a16e' 
  AND token = 'qrmhCHeX75Ak91XwVlYyPOX6sSp8pRszwWTzcFgCUS0=' 
  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"
    }
  }
}