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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f038383b682522d8d5703e40c9a9a20501f11d576430c705da2921a9b34cdff' 
  AND token = 'Bvtzm7CAYc0uVY2ryBjAIu7NrjZ38uFO7SLjpdN1OjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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