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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f58d65de71eb22197999de15a3b31603c1a8c331b36ec86c840df598ff17859e' 
  AND token = 'qSv1E+vJKUOd1C7WhtV8T+RDGhQcIctGtAdhEJs3FkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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