Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb0e34f52742140071c4c33268a06531028831083dac01ff9df37c74f547742a' 
  AND token = 'gr+/2RtHu7kFx7ydtuzdp2F4v7zXZ3cu6soF8qcNp4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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