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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72c9d0e228d54960d1cb76e47bb3fef992b8aa65b43fb42b40fbef30f6865ece' 
  AND token = 'TamhWvDVV04Mjcusxr0XK5Shh+IzMizrkxnycZxGXY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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