SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69330fe73dd39340440c49fdd53059520240bb1fc21751f5b5a6d3bb6f40ecd6' 
  AND token = 'lod+S8JV5POXkCmKcpFoH7DGfSwqV8zPyWJnIy8LhF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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