Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e99967dcaa61a2fc114b3e3ee56c75e68a281e3271b61e9f70af9ea9a9f77d7c' 
  AND token = 'LvyS2qg28ljVK9SIq7UcTlUTjVHABjhIR/sAcP/kuJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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