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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97c6d31a31c1f3e35a1f8704294d5ddf5f8117142a48428fac878f516f3ec7c1' 
  AND token = 'WLjL6NbgNrfjkNPo897DbE0amKMlkpA5djohxxhJKY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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