Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e31aa2e487860847b93bbc64a6c384eaf59b475ddda9e5d018fc49746a9a1ec' 
  AND token = 'wAp8d9AgkmDZJmVwk6CMXP8J/SvQPPQ9e8Yfaz01uXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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