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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18eaad913c535f8e0a202afd7fc340a25b82b8010a24feb86710fb2c3779f72f' 
  AND token = '/PlULaAO3GONIR0mJy//I5uVWY8uxzElquIFCYImQDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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