Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13361b29bc80587c0f56230768d19eef0cf80bace3cf1b4fbb0303fe1688d5d9' 
  AND token = 'e6yrWuc2NSTmnLF1GTZgMRn8BkrVwOG/XBWfinntmPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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