Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efd839ed001c265fc2db4052ed4e398040f4d76357759b8e907815064143299d' 
  AND token = 'PLW8/L5a533+lupGF9TjEP7bgmRcwL0daEio1OeQYrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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