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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b163f687843538bf90966ed0baf88ad9d68fc3d97dc5927fe96c56daa9a447e' 
  AND token = 'Vgf+an8eq8Bgvi9vPO21eG5vQ2YyXSVlg8Mtn4zxWyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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