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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63701bcad49e462f6c16f707a7423b6fa7619712ee61b2c2380010bf9cf74980' 
  AND token = 'tAku7RehMaMenVUOCLwBgfs71KLX32ZYYXP9j/gpTvY=' 
  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"
    }
  }
}