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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '868f7a84e82f369c64631279e0374c40ba507c077e959628e8e445be47a135a8' 
  AND token = 'qwrL273wsYOOyO0llVHM+TYydqal/+pe9hfH8xIGTpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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