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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d42e0c1e0923aa076762951205610d2dfb8bc83a028d423ac22645ed18d6bc4' 
  AND token = 'hn0lWeLqHCsXNgtNaL406GDm9urvycC/CrEO/WvXy+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00085

JSON explain

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