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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88576679e9d64bad245a8e2cc0b384a1be3a8f5f4f8e79d493d472f798877aee' 
  AND token = 'UCsA+xtOXHrwWVluuTGKzDA1yDEmTrTXxhv4hIWLiEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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