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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffb6735d085e9f4b25a8f08fbc37c7a4a7ef2858b76c57ad68a1dbb13cc6f3da' 
  AND token = 'zRhlZ4HwRGD37GMYWrqu+OXHu/d/nskzsduUPkzoeuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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