Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b963b3d6b5678a2044d5bdfb766cb84e08bf5372501c8fe20527ee6c96035855' 
  AND token = 'UbkqCLDMjXhE9BHrbSsVyvZA7vlPz8teRcZDmmTlx7Q=' 
  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"
    }
  }
}