Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd592c5099fc5206a87d9a66fdf87298696ac519b126338f8beb734719f86567' 
  AND token = 'emH55+CPuAchrkTvUvwlckgDcs80CtNOiBmvxceFifs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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