Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7d63d7a2b752ba3d66bf4eca9e83632da1d634dcb8b4287e9a7efefbb6cac49' 
  AND token = 'js4UCjidy9yOh84m8pJgIe1Sj5VX1aObDnM1eOz6J9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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