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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '533c9053498616a1b8d75b1fc7e7de74be564502ca9190229f02484e8928ad2c' 
  AND token = 'q0/7QkEaKpSTCoiEkr52WwyVkOkBfZgavKWtD7WdDwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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