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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9d2770a4fe4fd18f1ffe3a9adf6b809162cac37c10585f12b6cb7de12d4f396' 
  AND token = '3U0ZTOzZTVIIyJH3ntHWPJzRiQoE2Q8BZosBivrtMaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}