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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d58c2ee8b5ce3799bedfebcd99ecce047fdcbd53b9e0fda152458c2ea6b35a5' 
  AND token = 'BlIq4moH5PpW+gAI8QKeK37qfWlxZHmNTtMDAaFQewo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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