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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a8ae946a6641389a4123e0178018b8efd84510892c055f3c9f026d05b20d946' 
  AND token = 'bt3UZd/3EuE6GbuSyu8ut5ac1qiBmElBi22j8bRA5c0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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