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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d106971b8cb7a035b21b97cb351be864fb70bcef077355d7926dcd205c8aaf1' 
  AND token = 'XY/IeByoen8KyTfZ4zrSQ53Cj+hSo9iYbbiHWz2+YwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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