Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b9007bf7db7076fb57db91e13ce82ea6292adefdef2bc26f000d4eddc9c17bd' 
  AND token = 't/ZE40zLFu6souiW6TLJf4/l6vG9+ZEnRiRHsxHXU1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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