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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '204a8fa95f1e876d098b1139874239a6fdc28e368437e91470df33e4a45ecabc' 
  AND token = 'muPP9gCti/Xe1C/GOo27eR9kHZyEYgUXg7XuHGh49Ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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