Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '671456d1181347996806bfdc06e8f7eb953cc9e70536fa6334eeba9b0ce12f73' 
  AND token = 'k9VA6ZKk5AoYDcGhKFKfY5gqXt7bZU/2VyNmELhVwM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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