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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07d0054a6900bd11d6dda28a7ccc5ab2bbed7b07f2336f1476b7286dc94a16fd' 
  AND token = 'q/tjx09DW3mtk8LHuIFiXdDPWhd5HWOeQqHg/Adckxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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