Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbc707f0d70a208f6295a320e70f5e627adf9e11d65bc9107cf9967309c26f7c' 
  AND token = 'Kcvv8Q60zsETjUPFDJO9NRZM9Q8M43m2pUw2uzynb64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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